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cond-mat.str-el2008★ 3 cited
Valence Bond States: Link models
E. Rico, R. Hübener, S. Montangero +4
An isotropic anti-ferromagnetic quantum state on a square lattice is characterized by symmetry arguments only. By construction, this quantum state is the result of an underlying va…
cond-mat.str-el2006★ 37 cited
Enhancement of pairwise entanglement from $\mathbbm{Z}_2$ symmetry breaking
A. Osterloh, G. Palacios, S. Montangero
We study the effect of symmetry breaking in a quantum phase transition on pairwise entanglement in spin-1/2 models. We give a set of conditions on correlation functions a model has…